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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS (Acquisition - Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended		3 Months Ended	162 Months Ended	0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 21, 2012 item	Dec. 03, 2012	Dec. 31, 2013	Jun. 30, 2013	Nov. 08, 2010	Apr. 15, 2012
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS
Loss from equity method investment	$ 8,878,000us-gaap_IncomeLossFromEquityMethodInvestments	$ 9,586,000us-gaap_IncomeLossFromEquityMethodInvestments
Additions to investment through conversion of outstanding receivables		7,114,000utsi_NoncashOperatingActivitiesPurchaseOfConvertibleBondThroughConversionOfOutstandingReceivables
Investment impairment	3,947,000us-gaap_ImpairmentOfInvestments	9,400,000us-gaap_ImpairmentOfInvestments	3,043,000us-gaap_ImpairmentOfInvestments
Investment	59,799,000us-gaap_LongTermInvestments	74,588,000us-gaap_LongTermInvestments				74,588,000us-gaap_LongTermInvestments
Equity Method [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS
Investment	9,228,000us-gaap_LongTermInvestments / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember	14,536,000us-gaap_LongTermInvestments / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember				14,536,000us-gaap_LongTermInvestments / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember
Series A Preferred Stock [Member] | UiTV Media Inc. or UiTV [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS
Book value after reduction due to percentage of equity loss pick up	0utsi_VariableInterestEntityInvestmentBookValueAfterReductionDueToOwnershipPercentage / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = utsi_UiTVMediaIncMember
UiTV Media Inc. or UiTV [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS
Percentage of shares acquired				49.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember				75.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember
Number of Board seats held before the repurchase				3utsi_NumberOfBoardSeatsHeldBeforeTransferBackOfShares / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember
Number of Board seats held				2utsi_NumberOfBoardSeatsHeld / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember
Number of total Board seats				5utsi_NumberOfTotalBoardSeats / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember
Equity method investment, ownership interest (as a percent)	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember
Ownership interest upon conversion of preference shares and convertible bonds		73.00%utsi_EquityMethodInvestmentOwnershipPercentageUponConversionOfSecurities / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember				73.00%utsi_EquityMethodInvestmentOwnershipPercentageUponConversionOfSecurities / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember
Number of board members out of 5 members that may be appointed by founder and CEO of investee unless voting interest fall below 10%	3utsi_EquityMethodInvestmentRightToInvesteeToAppointNumberOfBoardMembersOutOfFiveBoardMembersUnlessEquityInterestFallsBelow10Percent / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember
Equity loss pick up (as a percent)	49.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember
Percentage of losses of VIE that will be recognized by company until convertible bond investment balance has been depleted	100.00%utsi_VariableInterestEntityPercentageOfLossesWillRecognizedByReportingEntityUntilInvestmentBalanceHasBeenDepleted / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember
UiTV Media Inc. or UiTV [Member] | Equity Method [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS
Loss from equity method investment	5,300,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember	9,600,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember
Investment impairment	2,400,000us-gaap_ImpairmentOfInvestments / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember	9,100,000us-gaap_ImpairmentOfInvestments / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember
UiTV Media Inc. or UiTV [Member] | Series A Preferred Stock [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS
Amount invested		20,000,000us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SeriesAPreferredStockMember				20,000,000us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_SeriesAPreferredStockMember
UiTV Media Inc. or UiTV [Member] | Convertible Bond [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS
Interest rate of debt securities (as a percent)					6.50%invest_InvestmentInterestRate / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
Principal amount of consideration received					3,000,000us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationReceived1 / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
Loss from equity method investment	3,600,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
Amount invested		35,100,000us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember				35,100,000us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
UiTV Media Inc. or UiTV [Member] | Convertible Bond [Member] | Equity Method [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS
Principal amount of consideration received						12,100,000us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationReceived1 / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember	15,000,000us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationReceived1 / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
Cash paid to acquire investment						5,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
Additions to investment through conversion of outstanding receivables						7,100,000utsi_NoncashOperatingActivitiesPurchaseOfConvertibleBondThroughConversionOfOutstandingReceivables / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
Amount invested	20,000,000us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
Investment impairment	3,600,000us-gaap_ImpairmentOfInvestments / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_InvestmentSecondaryCategorizationAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember
UiTV Media Inc. or UiTV [Member] | Convertible Bond [Member] | Maximum [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS
Price per share of qualified financing as a percentage of per share price used to determine conversion of debt securities					85.00%utsi_PricePerShareOfQualifiedFinancingAsPercentageOfPerSharePriceUsedForDeterminationOfConversionOfDebtSecurities / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ConvertibleDebtSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember
UiTV Media Inc. or UiTV [Member] | Series A Preference Shares [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS
Number of shares purchased								9,600,000utsi_BusinessAcquisitionNumberOfSharesPurchased / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Aggregate cash consideration								20,000,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
Repurchase of ordinary shares from iTV shareholder (in shares)								1,491,091utsi_TreasuryStockSharesAcquiredTreasuryStockValueAcquiredFromSubsidiaryShareholders / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember
UiTV Media Inc. or UiTV [Member] | Smart Frontier [Member] | Ordinary Shares [Member]
CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS
Number of shares purchased								5,100,000utsi_BusinessAcquisitionNumberOfSharesPurchased / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / dei_LegalEntityAxis = utsi_SmartFrontierHoldingsLimitedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Aggregate purchase price								10,000,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / dei_LegalEntityAxis = utsi_SmartFrontierHoldingsLimitedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Percentage of shares acquired								51.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / dei_LegalEntityAxis = utsi_SmartFrontierHoldingsLimitedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Fair value of shares issued								$ 9,800,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / dei_LegalEntityAxis = utsi_SmartFrontierHoldingsLimitedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Number of shares of acquiree transferred back				5,100,000utsi_ShareExchangeAgreementSharesTransferredBackToNoncontrollingOwner / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / dei_LegalEntityAxis = utsi_SmartFrontierHoldingsLimitedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Repurchase of ordinary shares from iTV shareholder (in shares)									1,491,091utsi_TreasuryStockSharesAcquiredTreasuryStockValueAcquiredFromSubsidiaryShareholders / us-gaap_BusinessAcquisitionAxis = utsi_UiTVMediaIncMember / dei_LegalEntityAxis = utsi_SmartFrontierHoldingsLimitedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember

X

- Definition

The interest rate for investments that have an interest rate. For fixed rate investments, this indicates the fixed interest rate. If the investment has a variable interest rate, the rate stated here may be the rate that is currently relevant. In this case the "Investment, Interest Rate is Current Rate for Variable Rate Investment Flag", "Investment, Interest Rate is Discount Rate at Purchase Flag", "Investment, Interest Rate Reflects Current Yield Flag" should be used. If one of these flags are not appropriate to explain the interest rate that is indicated, then a new flag should be added or an explanation should be included in "Investment, Additional Information".

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Represents the percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting upon conversion of convertible securities.

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X

- Definition

Represents the number of board member out of five board member tht may be elected by the equity method investee unless equity interest fall below 10 percent.

+ References

No definition available.

+ Details

Name:	utsi_EquityMethodInvestmentRightToInvesteeToAppointNumberOfBoardMembersOutOfFiveBoardMembersUnlessEquityInterestFallsBelow10Percent
Namespace Prefix:	utsi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the convertible bonds acquired through conversion of outstanding receivables in noncash operating activities.

+ References

No definition available.

+ Details

Name:	utsi_NoncashOperatingActivitiesPurchaseOfConvertibleBondThroughConversionOfOutstandingReceivables
Namespace Prefix:	utsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the number of board seats of the investee held by the entity.

+ References

No definition available.

+ Details

Name:	utsi_NumberOfBoardSeatsHeld
Namespace Prefix:	utsi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of board seats of the investee held by the entity before the transfer back of the purchased shares shares.

+ References

No definition available.

+ Details

Name:	utsi_NumberOfBoardSeatsHeldBeforeTransferBackOfShares
Namespace Prefix:	utsi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of total board seats of the investee entity.

+ References

No definition available.

+ Details

Name:	utsi_NumberOfTotalBoardSeats
Namespace Prefix:	utsi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the price per share of qualified financing expressed as a percentage of per share price, which is used to determine the conversion of debt securities.

+ References

No definition available.

+ Details

Name:	utsi_PricePerShareOfQualifiedFinancingAsPercentageOfPerSharePriceUsedForDeterminationOfConversionOfDebtSecurities
Namespace Prefix:	utsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of shares transferred back by the entity to the noncontrolling interest owner, resulting in deconsolidation of the subsidiary.

+ References

No definition available.

+ Details

Name:	utsi_ShareExchangeAgreementSharesTransferredBackToNoncontrollingOwner
Namespace Prefix:	utsi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of shares that have been repurchased during the period from shareholders of the subsidiary and are being held in treasury.

+ References

No definition available.

+ Details

Name:	utsi_TreasuryStockSharesAcquiredTreasuryStockValueAcquiredFromSubsidiaryShareholders
Namespace Prefix:	utsi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the book value of investment after reduction due to ownership percentage.

+ References

No definition available.

+ Details

Name:	utsi_VariableInterestEntityInvestmentBookValueAfterReductionDueToOwnershipPercentage
Namespace Prefix:	utsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the percentage of losses of variable interest entity that will be recognized by company until investment balance has been depleted.

+ References

No definition available.

+ Details

Name:	utsi_VariableInterestEntityPercentageOfLossesWillRecognizedByReportingEntityUntilInvestmentBalanceHasBeenDepleted
Namespace Prefix:	utsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=utsi_UiTVMediaIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentSecondaryCategorizationAxis=us-gaap_EquityMethodInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_SeriesAPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: